package com.magtonic.communication;

import java.io.*;
import java.util.*;

import android.app.Activity;
import android.bluetooth.*;
import android.content.*;
import android.os.*;
import android.util.*;
/**
 * used to process bluetooth function
 * @author vicchou
 *
 */
public class BTSerial{// Activity {
	// Debugging
	static final boolean DEBUG = true;
    static final String TAG = "BTSerial";

    // Name for the SDP record when creating server socket
    static final String NAME = "BTSerial";

    // Unique UUID for this application
    static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    // Constants that indicate the current connection state
    public static final int STATE_NONE = 0;       // we're doing nothing
    public static final int STATE_LISTEN = 1;     // now listening for incoming connections
    public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
    public static final int STATE_CONNECTED = 3;  // now connected to a remote device
    
    public static final int MESSAGE_STATE_CHANGE = 1;
    public static final int MESSAGE_READ = 2;
    public static final int MESSAGE_WRITE = 3;
    public static final int MESSAGE_DEVICE_NAME = 4;
    public static final int MESSAGE_TOAST = 5;
    
    public static final int REQUEST_ENABLE_BT = 1;
    public static final int REQUEST_GETDEVLIST_BT = 2;
    
    public static final String DEVICE_NAME = "BTD_NAME";
    public static final String DEVICE_ADDR = "BTD_ADDR";
    public static final String DEVICE_TX = "BTD_TX";
    public static final String DEVICE_RX = "BTD_RX";
    public static final String TOAST = "toast";  
    //
    // Member fields
    BluetoothAdapter mAdapter;
    BluetoothDevice mDevice;
    
    //BTBoardcastReceiver btBR;
    //BluetoothDialog_old bluetoothDialog_old;
    //
	public static final IntentFilter ActionFoundFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
	public static final IntentFilter FinishFoundFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
	
	Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
	//
	Handler mCallBackHandler;
    AcceptThread mAcceptThread;
    ConnectThread mConnectThread;
    ConnectedThread mConnectedThread;
	int mState;
    //
    public BTSerial(){
    	    	
    	mState = STATE_NONE;
    	
    	if(mAdapter == null)
    		mAdapter = BluetoothAdapter.getDefaultAdapter();   	
    }	
    //
	public BTSerial(Handler callbackhandler){
    	mCallBackHandler = callbackhandler;
    	
    	mState = STATE_NONE;
    	
    	if(mAdapter == null)
    		mAdapter = BluetoothAdapter.getDefaultAdapter();   	
    }	
    /*
     * get Bluetooth enable status
     */
    public boolean getEnableStatus(){
    	return mAdapter.isEnabled();
    }
    /**
     * set Bluetooth enable and get the callback from "onActivityResult"
     */
    public void setEnable(Activity activity){
    	//if(DEBUG) Log.d(TAG, "setEnable " );
    	// If BT is not on, request that it be enabled.
		if (!mAdapter.isEnabled()) {
			activity.startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
			//mainActivity.registerReceiver(btBR, actionFoundFilter);
		}
    } 
    /**
     * set disable when bt function dismiss 
     */
    public void setDisable(){
    	//mainActivity.unregisterReceiver(btBR);
    	mAdapter.disable();
    }
    /**
     * start bluetooth device list discovery
     */
    public void startDiscovery(){//BluetoothDialog_old btd){
    	if(DEBUG) Log.d(TAG, "startDiscovery " + mAdapter.getState() );
    	
    	mBluetoothList.clear();
    	btdCnt = 0;
    	//   	
    	if(mAdapter.isDiscovering())  mAdapter.cancelDiscovery();
    	
        mAdapter.startDiscovery();
    }
    /**
     * stop bluetooth device list discovery
     */
    public void cancelDiscovery(){
    	if(DEBUG) Log.d(TAG, "cancelDiscovery " + mAdapter.getState() );
    	
    	if(mAdapter.isDiscovering())  mAdapter.cancelDiscovery();
    }
 
    public void getPairedList(){
    	Set<BluetoothDevice> pairedDevices = mAdapter.getBondedDevices();
    	// If there are paired devices
    	if (pairedDevices.size() > 0) {
    	    // Loop through paired devices
    	    for (BluetoothDevice device : pairedDevices) {
    	        // Add the name and address to an array adapter to show in a ListView
    	        HashMap<String,String> item = new HashMap<String,String>();
        		item.put(DEVICE_NAME, device.getName());
        		item.put(DEVICE_ADDR, device.getAddress());
        		mBluetoothList.add(item);
    	    }
    	}
    }
    //
    public ArrayList<HashMap<String,String>> mBluetoothList = new ArrayList<HashMap<String,String>>();
    public int btdCnt = 0;
    /**
     * receive broadcast from bluetooth device
     * @author vicchou
     *
     */
    public void onReceive(Context context, Intent intent) {
		if(DEBUG) Log.d(TAG, "onReceive " + intent.getAction());
		//
		if(intent.getAction().equals(BluetoothDevice.ACTION_FOUND)){
				
    		BluetoothDevice bluetoothDev = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    		
    		if(bluetoothDev.getBluetoothClass().getMajorDeviceClass() == BluetoothClass.Device.Major.UNCATEGORIZED ||			
    			bluetoothDev.getBluetoothClass().getMajorDeviceClass() == BluetoothClass.Device.Major.AUDIO_VIDEO ){
    			++btdCnt;
    			if(DEBUG) Log.d(TAG, "count " + btdCnt);
    			
        		HashMap<String,String> item = new HashMap<String,String>();
        		//bluetoothDev.getBondState()
        		item.put(DEVICE_NAME, bluetoothDev.getName());
        		item.put(DEVICE_ADDR, bluetoothDev.getAddress());
        		mBluetoothList.add(item);
        		
        		if(DEBUG) Log.d(TAG, "name:" + item.get(DEVICE_NAME) + " addr:" + item.get(DEVICE_ADDR));
        		
        		//bluetoothDialog_old.showDialog();
    		}
    		//
    		//if(DEBUG) Log.d(TAG, " " +bluetoothDev.getBluetoothClass().getMajorDeviceClass() + '@' + Integer.toHexString(hashCode()));
    			
		}
    }
    
    //
    /**
     * Set the current state of the chat connection
     * @param state  An integer defining the current connection state
     */
    private synchronized void setState(int state) {
    	if(DEBUG) Log.d(TAG, "setState() " + mState + " -> " + state);
        mState = state;

        // Give the new state to the Handler so the UI Activity can update
        mCallBackHandler.obtainMessage(MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
    }

    /**
     * Return the current connection state. */
    public synchronized int getState() {
        return mState;
    }

    /**
     * Start the chat service. Specifically start AcceptThread to begin a
     * session in listening (server) mode. Called by the Activity onResume() */
    public synchronized void start() {
    	if(DEBUG) Log.d(TAG, "start");

        // Cancel any thread attempting to make a connection
        if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}

        // Cancel any thread currently running a connection
        if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
        
        setState(STATE_LISTEN);
        
        // Start the thread to listen on a BluetoothServerSocket
        if (mAcceptThread == null) {
            mAcceptThread = new AcceptThread();
            mAcceptThread.start();
        }  
    }

    /**
     * Start the ConnectThread to initiate a connection to a remote device.
     * @param device  The BluetoothDevice to connect
     */
    public synchronized void connect(BluetoothDevice device) {
    	if(DEBUG) Log.d(TAG, "connect to: " + device);

        // Cancel any thread attempting to make a connection
        if (mState == STATE_CONNECTING) {
            if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
        }

        // Cancel any thread currently running a connection
        if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}

        // Start the thread to connect with the given device
        mConnectThread = new ConnectThread(device);
        mConnectThread.start();
        setState(STATE_CONNECTING);
    }
    
    /**
     * Start the ConnectThread to initiate a connection to a remote device.
     * @param device  The BluetoothDevice to connect
     */
    public synchronized void connect(String deviceAddr) {
    	if(DEBUG) Log.d(TAG, "connect to: " + deviceAddr);

    	BluetoothDevice device = mAdapter.getRemoteDevice(deviceAddr);
    	
        // Cancel any thread attempting to make a connection
        if (mState == STATE_CONNECTING) {
            if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
        }

        // Cancel any thread currently running a connection
        if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}

        // Start the thread to connect with the given device
        mConnectThread = new ConnectThread(device);
        mConnectThread.start();
        setState(STATE_CONNECTING);
    }

    /**
     * Start the ConnectedThread to begin managing a Bluetooth connection
     * @param socket  The BluetoothSocket on which the connection was made
     * @param device  The BluetoothDevice that has been connected
     */
    public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
    	if(DEBUG) Log.d(TAG, "connected");

        // Cancel the thread that completed the connection
        if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}

        // Cancel any thread currently running a connection
        if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}

        // Cancel the accept thread because we only want to connect to one device
        if (mAcceptThread != null) {mAcceptThread.cancel(); mAcceptThread = null;}

        // Start the thread to manage the connection and perform transmissions
        mConnectedThread = new ConnectedThread(socket);
        mConnectedThread.start();

        // Send the name of the connected device back to the UI Activity
        Message msg = mCallBackHandler.obtainMessage(MESSAGE_DEVICE_NAME);
        Bundle bundle = new Bundle();
        bundle.putString(DEVICE_NAME, device.getName());
        msg.setData(bundle);
        mCallBackHandler.sendMessage(msg);

        setState(STATE_CONNECTED);
    }

    /**
     * Stop all threads
     */
    public synchronized void stop() {
    	if(DEBUG) Log.d(TAG, "stop");
    	//
        if (mConnectThread != null) { mConnectThread.cancel();  mConnectThread = null;}
        if (mConnectedThread != null) { mConnectedThread.cancel();  mConnectedThread = null;}
        if (mAcceptThread != null) { mAcceptThread.cancel();  mAcceptThread = null;}
        setState(STATE_NONE);
    }

    /**
     * Write to the ConnectedThread in an unsynchronized manner
     * @param out The bytes to write
     * @see ConnectedThread#write(byte[])
     */
    public void write(byte[] out) {
        // Create temporary object
        ConnectedThread r;
        // Synchronize a copy of the ConnectedThread
        synchronized (this) {
            if (mState != STATE_CONNECTED) return;
            r = mConnectedThread;
        }
        // Perform the write unsynchronized
        r.write(out);
    }

    /**
     * Indicate that the connection attempt failed and notify the UI Activity.
     */
    private void connectionFailed() {
        setState(STATE_LISTEN);
        
        // Send a failure message back to the Activity
        Message msg = mCallBackHandler.obtainMessage(MESSAGE_TOAST);
        Bundle bundle = new Bundle();
        bundle.putString(TOAST, "Unable to connect device");
        msg.setData(bundle);
        mCallBackHandler.sendMessage(msg);
    }

    /**
     * Indicate that the connection was lost and notify the UI Activity.
     */
    private void connectionLost() {
        setState(STATE_LISTEN);

        // Send a failure message back to the Activity
        Message msg = mCallBackHandler.obtainMessage(MESSAGE_TOAST);
        Bundle bundle = new Bundle();
        bundle.putString(TOAST, "Device connection was lost");
        msg.setData(bundle);
        mCallBackHandler.sendMessage(msg);
    }

    /**
     * This thread runs while listening for incoming connections. It behaves
     * like a server-side client. It runs until a connection is accepted
     * (or until cancelled).
     */
    private class AcceptThread extends Thread {
        // The local server socket
        private final BluetoothServerSocket mmServerSocket;

        public AcceptThread() {
            BluetoothServerSocket tmp = null;

            // Create a new listening server socket
            try {
                tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
            } catch (IOException e) {
                Log.e(TAG, "listen() failed", e);
            }
            mmServerSocket = tmp;
        }

        public void run() {
        	if(DEBUG) Log.d(TAG, "BEGIN mAcceptThread" + this);
            setName("AcceptThread");
            BluetoothSocket socket = null;

            // Listen to the server socket if we're not connected
            while (mState != STATE_CONNECTED) {
                try {
                    // This is a blocking call and will only return on a
                    // successful connection or an exception
                    socket = mmServerSocket.accept();
                } catch (IOException e) {
                    Log.e(TAG, "accept() failed", e);
                    break;
                }

                // If a connection was accepted
                if (socket != null) {
                    synchronized (BTSerial.this) {
                        switch (mState) {
	                        case STATE_LISTEN:
	                        case STATE_CONNECTING:
	                            // Situation normal. Start the connected thread.
	                            connected(socket, socket.getRemoteDevice());
	                            break;
	                        case STATE_NONE:
	                        case STATE_CONNECTED:
	                            // Either not ready or already connected. Terminate new socket.
	                            try {
	                                socket.close();
	                            } catch (IOException e) {
	                                Log.e(TAG, "Could not close unwanted socket", e);
	                            }
	                            break;
                        }
                    }
                }
            }
            if(DEBUG) Log.i(TAG, "END mAcceptThread");
        }

        public void cancel() {
        	if(DEBUG) Log.d(TAG, "cancel " + this);
            try {
                mmServerSocket.close();
            } catch (IOException e) {
                Log.e(TAG, "close() of server failed", e);
            }
        }
    }


    /**
     * This thread runs while attempting to make an outgoing connection
     * with a device. It runs straight through; the connection either
     * succeeds or fails.
     */
    private class ConnectThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final BluetoothDevice mmDevice;

        public ConnectThread(BluetoothDevice device) {
            mmDevice = device;
            BluetoothSocket tmp = null;

            // Get a BluetoothSocket for a connection with the
            // given BluetoothDevice
            try {
                tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
            } catch (IOException e) {
                Log.e(TAG, "create() failed", e);
            }
            mmSocket = tmp;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectThread");
            setName("ConnectThread");

            // Always cancel discovery because it will slow down a connection
            mAdapter.cancelDiscovery();

            // Make a connection to the BluetoothSocket
            try {
                // This is a blocking call and will only return on a
                // successful connection or an exception
                mmSocket.connect();
            } catch (IOException e) {
                connectionFailed();
                Log.e(TAG, "connectionFailed", e);
                // Close the socket
                try {
                    mmSocket.close();
                } catch (IOException e2) {
                    Log.e(TAG, "unable to close() socket during connection failure", e2);
                }
                // Start the service over to restart listening mode
                BTSerial.this.start();
                return;
            }

            // Reset the ConnectThread because we're done
            synchronized (BTSerial.this) {
                mConnectThread = null;
            }

            // Start the connected thread
            connected(mmSocket, mmDevice);
        }

        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) {
                Log.e(TAG, "close() of connect socket failed", e);
            }
        }
    }

    /**
     * This thread runs during a connection with a remote device.
     * It handles all incoming and outgoing transmissions.
     */
    private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            Log.d(TAG, "create ConnectedThread");
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) {
                Log.e(TAG, "temp sockets not created", e);
            }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectedThread");
            byte[] buffer = new byte[1024];
            int bytes;

            // Keep listening to the InputStream while connected
            while (true) {
                try {
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);

                    // Send the obtained bytes to the UI Activity
                    mCallBackHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
                } catch (IOException e) {
                    Log.e(TAG, "disconnected", e);
                    connectionLost();
                    break;
                }
            }
        }

        /**
         * Write to the connected OutStream.
         * @param buffer  The bytes to write
         */
        public void write(byte[] buffer) {
            try {
                mmOutStream.write(buffer);

                // Share the sent message back to the UI Activity
                mCallBackHandler.obtainMessage(MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
            } catch (IOException e) {
                Log.e(TAG, "Exception during write", e);
            }
        }

        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) {
                Log.e(TAG, "close() of connect socket failed", e);
            }
        }
    }
    
}
